The method of claim 1, wherein the step of capturing a degraded media signal comprises: converting the stream of packets to obtain an analog media signal; and capturing the analog media signal from a device under test. The server computer manipulates data packets from the reference media file to simulate impairments, including losses, errors, noise and jitter, at a much lower cost than using actual faders. Comes from a reliable source. The apparatus of claim 24, wherein the server computer includes a de-jitter buffer and wherein the capturing the impaired stream of packets to provide a degraded media signal comprises passing the impaired stream of packets through the de-jitter buffer. Use of transcoding can introduce further delays.
Although the present invention has been described above with particularity, this was merely to teach one of ordinary skill in the art how to make and use the invention. Thank you for checking out our listing. Additionally, packets 7 and 8 are reordered due to delays in the network. Unit is on hand and ready to ship. Many additional modifications will fall within the scope of the invention, as that scope is defined by the following claims. Sold as is for parts or repair! These new packets may impact the final packet order, and require functionally that is akin to a de-jitter buffer. Please see the pictures of this actual item.
The method of claim 12, wherein the reference media signal comprises a reference voice signal and a reference video signal. Please reach out to us directly if there is a problem. No repairs, no guarantees, no returns! The wireless system 8 can include a base station for mobile phone communications. In some embodiments the test system can be run in the uplink direction. A packet can be lost if the maximum number of retransmissions is reached or when a Nack indication is corrupted and interpreted as an Ack. The audio signal played through the speaker provides a degraded media signal 11 to listeners. The score for a wireless connection depends on the codec, or signal encoding and decoding method that is used.
Please see all pictures and ask any questions before bidding. Sold as is for parts or repair! Comes with cords pictured, hard case, and soft case. In step 804 a determination is made if a packet has been lost. If a simulation step changes the order of the frames, the packets are sorted in a sorting step after the simulation step is finished. The need to reorder packets increases the complexity of the simulation, because new packets continue to enter into the simulation while the reordering is taking place. If so, in step 624 timing is delayed for the packet so it can be placed in the correct order.
Every time a new handset is introduced, it should be tested to make sure it produces clear audio and video under ideal and under degraded coverage conditions. The test system uses a server computer to eliminate the need for faders and other test equipment conventionally used. There are alternative ways to produce the degraded file 11 for evaluation. This can be done because all losses and jitter will be simulated instead. The apparatus of claim 18, wherein the first impairments comprise a simulated dropping of a first individual packet that causes a delay at the output of a second individual packet.
The reference media file created is also stored in a memory as a reference digital media file for later analysis. The test system server can estimate media quality for voice and for video media. In the target system those roles are reversed. In another embodiment the test system can provide and analyze video signals. The non-real time preparation does not only simplify the reordering of out-of-order packets. Test Set has been tested working onsite! The server computer manipulates data packets from the reference media file to simulate noise and jitter at a much lower cost than using actual faders.
The signaling tester can be a simple one that emulates an ideal air interface that does not introduce further impairments or fading. In this non-real time mode, sorting or reordering can be provided at each air interface simulation that would otherwise introduce a non-real time component. The score also strongly depends on the latency and reliability of the air interfaces 6 and 10. Typically the media quality is measured or estimated for voice media or for video media. Packet 6 is shown to arrive late because it took too many retransmissions. All offers considered, no reasonable offer refused.
This causes precisely controlled losses, delays, jitter and frame errors on the air interfaces. Unit is on hand and ready to ship. The segmentation may also split a large media packet, like a video packet, into smaller segments. The method of claim 2, wherein at least one of the first simulated impairments and the second simulated impairments comprises a simulated dropping of a first individual packet that causes a delay in the transmitting of a second individual packet. Please reach out to us directly if there is a problem.
The impairments introduced can also simulate a dropping of a first individual packet that causes a delay in transmission of a second individual packet, a condition that causes packets to bunch up which will affect voice quality. The devices 2 and 4 can be cellular mobile phones. In one embodiment of the present invention, the simulated impaired packet stream is saved in memory as a first reference media file. . Please see all pictures and ask any questions before bidding. The server computer also uses software to provide a solution for automated assessment of the speech quality as experienced by a user of a wireless telephony system. We are surplus equipment dealers and do not have the ability or knowledge to test equipment for functionality beyond plugging it in and describing what we observe as best we can.